Deadfire was NOT a financial failure. Enough with the hyperbole. Obsidian has said very clarly that they ended up making money on Deadfire. The issue was that sales were a disappointment relative to Obsidian's expectations for the game, including that it was lower than the sales of the first game.
Nobody has yet provided me with any proof that TB combat is what drove D:OS2's sales. It could've been TB, but there are several other factors that differentiate that game from other similar contemporary cRPGs, so claiming TB was the cause is completely spurious. Furthermore, there are plenty of contemporary TB RPGs out there with abysmal sales numbers.